Neck pain

69 year-old woman presents with constant pain in her lower posterior neck since 3 weeks.
No H/o- fever, weakness, numbness, chest pain, or shortness of breath.
On further questioning, she states that she experiences occasional chills.
Physical examination reveals normal vital signs except for a temperature of 100 F.
The patient has restricted range of motion in her neck, and movement exacerbates her pain. Her neurologic examination is normal.
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